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Configuring Spanning Tree Protocol (STP) and IronSpan Features
December 2005
© Foundry Networks, Inc.
7 - 47
The
force-migration-check
parameter forces the specified port to sent one RST BPDU. If only STP BPDUs are
received in response to the sent RST BPDU, then the port will go return to sending STP BPDUs.
EXAMPLE:
Suppose you want to enable 802.1W on a system with no active port-based VLANs and change the hello-time
from the default value of 2 to 8 seconds. Additionally, suppose you want to change the path and priority costs for
port 5 only. To do so, enter the following commands.
FESX424 Router(config)# spanning-tree 802-1w hello-time 8
FESX424 Router(config)# spanning-tree 802-1w ethernet 5 path-cost 15 priority 64
Displaying Information About 802-1W
To display a summary of 802-1W, use the following command:
Syntax:
show 802-1w [vlan <vlan-id>]
The
vlan
<vlan-id> parameter displays 802.1W information for the specified port-based VLAN.
The
show 802.1w display
command shows the information listed in Table 7.8.
Table 7.8: CLI Display of 802.1W Summary
This Field...
Displays...
VLAN ID
The port-based VLAN that owns the STP instance. VLAN 1 is the
default VLAN. If you have not configured port-based VLANs on this
device, all 802.1W information is for VLAN 1.
FastIron SuperX Router(config)#
show 802-1w
--- VLAN 1 [ STP Instance owned by VLAN 1 ] ----------------------------
VLAN 1 BPDU cam_index is 2 and the IGC and DMA master Are(HEX) 0 1 2 3
Bridge IEEE 802.1W Parameters:
Bridge Bridge Bridge Bridge Force tx
Identifier MaxAge Hello FwdDly Version Hold
hex sec sec sec cnt
800000e080541700 20 2 15 Default 3
RootBridge RootPath DesignatedBri- Root Max Fwd Hel
Identifier Cost dge Identifier Port Age Dly lo
hex hex sec sec sec
800000e0804c9c00 200000 800000e0804c9c00 1 20 15 2
Port IEEE 802.1W Parameters:
<--- Config Params -->|<-------------- Current state ----------------->
Port Pri PortPath P2P Edge Role State Designa- Designated
Num Cost Mac Port ted cost bridge
1 128 200000 F F ROOT FORWARDING 0 800000e0804c9c00
2 128 200000 F F DESIGNATED FORWARDING 200000 800000e080541700
3 128 200000 F F DESIGNATED FORWARDING 200000 800000e080541700
4 128 200000 F F BACKUP DISCARDING 200000 800000e080541700
Summary of Contents for FastIron Edge Switch X424
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